Hand pneumatic tool.



No. 807,452. PATENTED DEG. I9, 1905. E. FRANKE. HAND PNBUMATIC TOOL.

APPLICATION FILED SEPT. 2. 1905.

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By his Altorney UNITED STATES PATENT @FFIGE HAND PNEUMATIC TOOL.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application iled September 2, 1905. Serial No. 276,871.

T0 all whom t may concern:

Be it known that I, EMiL FRANKE, a citizen of the United States,residing at Hicksville, Long Island, in the county of Queens and Stateof New York, have invented new and useful Improvements in Hand PneumaticTools, of which the following is a speciiication.

This invention relates to pneumatic tools such as are adaptedparticularly for boring and similar operations.

The objects of the invention are to improve and simplify theconstruction of such devices; furthermore, to increase their efficiencyin operation and to decrease the eX- ense attending their manufacture.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed as a practical embodiment thereof.

In the accompanying drawings, forming part of this specification, Figure1 is a side elevation of a pneumatic tool constructed in accordance withthe invention. Fig. 2 yis a similar view, partly in section. Fig. 3 is alongitudinal section taken at a right angle to Fig. 2. Fig. 4 is atransverse section on the line 4 4 of Fig. 3. Fig. 5 is a similarsection on the line 5 5 of Fig. 5. Fig. 6 is an under plan view of thehead or handle portion of the tool.

Like reference numerals indicate corresponding parts in the differentfigures of the drawings.

The improved tool of the present invention comprises a casing 1, havinga head or handle portion 2, which may be of any suitable form andconstruction. Mounted in the casing 1 is a rotary member or shaft 3, toone end of which is secured a tool-holding device, such as 4, which maybe of any convenient or well-known form and construction adapted to holda tool for boring or other purposes. The rotary member or shaft 3preferably is enlarged within the casing 1 to form an annular shoulder5, against which bears a plurality of antifriction-balls 6, that restagainst an internal shoulder 7 of the casing 1. At the end thereofwithin the casing 1 the rotary member 3 is formed with a set ofturbine-blades 8, said blades radiating from a centrally-locatedsemicircular depression in which is seated an antifriction-ball 9,fitting into a similar depression in a tubular eX- tension 10, formed onthe head or handle portion 2 and projecting into the end of thecasing 1. In addition to the turbine-blades 8 the rotary member or shaft3 is formed with a separate set of turbine-blades 11, which are arrangedaround the periphery of said rotary member or shaft.

Formed in the casing 1 adjacent to the turbine-blades 8, as shown inFig. 5, is a pair of oppositelydisposed outlets 12 13, which open attheir outer ends into grooves 14 15, formed in the inside faces ofplates 16 17, which are removably secured to the casing 1 in anysuitable manner, preferably as hereinafter described. The grooves 14 15at their lower ends open into inlets 13 19, which enter the casing 1adjacent to the turbineblades 11. Formed in the casing 1 adjacent to theblades 11 is a pair of oppositely-disposed outlets 2() 21, as shown inFig. 4, which open into grooves 22 23 in the plates 16 and 17, saidgrooves 22 23 having outlets 24 25 at their upper ends, as shown in Fig.5.

While the removable plates 16 and 17 may be held in place in anysuitable manner, said plates preferably are secured in position bydovetailing or undercutting the lower end of the slots in the casing 1,as indicated at 27 in Fig. 2, and by forming said plates with projectingtongues 28, Which fit into slots 29 in the head or' handle portion 2.

Extending through the head or handle portion 2 is a bore 29, which isthreaded at its upper end, as indicated at 30, to receive a pipe forsupplying compressed air or other suitable fluid for operating thedevice. At its lower end the bore 4 branches into a plurality ofradially-disposed passages 31, as indicated in Figs. 2, 3, and 6.

The bore 29 is controlled by means of a valve 32, which is normallypressed outward by means of a coil-spring 33, said valve being formedwith an annular groove 34, which permits the passage of compressed airwhen the valve is forced inward. The valve 32 is formed with a cut-awayportion 35, into which fits a limiting member 36, pivotally mounted uponascrew or bolt 37. By swinging the limiting member 36 upon its pivotuntil said limiting member becomes disengaged from the cut-away portion35 of the valve 32 said valve can be radially removed from the head 1whenever desired.

Constructed as above described, the operation of the improved device isas follows: When the valve 32 is pushed inward, the

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compressed air or other fluid element passes along the bore 29 andthrough the radiating passages 31. Upon leaving the passages 31 themotive fluid impinges against the rst set of turbine-blades 8 andimparts a rotary motion to the shaft 3. After striking the blades 8 thecompressed air passes through the outlets 12 13, grooves 14 15, andinlets 18 19, so that it is caused to impingel against the second set ofturbine-blades 11, thus serving a second time to aid in the operation ofrotating the shaft 3. After impinging against the turbine-blades 11 themotive fluid passes through the outlets 19 20, grooves 22 23, andoutlets 25.

While the head 2 may be held upon the casing 1 in any suitable manner,said head preferably is secured in position by means of a screw or bolt40, which extends through the casing 1 and engages the tubular extension`10, as shown in Figs. 1 and 8.

The pneumatic tool of this invention is strong, simple, durable, andinexpensive in construction, as well as thoroughly eflicient inoperation.

Changes in the precise embodiment of invention illustrated and describedmay be made Within the scope of the following claims without departingfrom the spirit of the invention or sacrificing any of its advantages.

Having thus Idescribed the invention, what is claimed as new is- 1. Ahand-tool comprising a casing, a rotary member therein'having a set ofturbineblades on one end thereof and a second set of turbine-bladesintermediate the ends thereof,

` said second set of turbine-blades being adapted to be impinged upon bymotive fluid directed tangentially against the periphery of the rotarymember, means for securing an implement to said rotary member, and meansfor directing motive fluid slantingly against the first set ofturbine-blades and tangentially against the second set ofturbineeblades.

2. A hand pneumatic tool comprising a casing, a rotary member in saidcasing, having one set of turbine-blades upon the end thereof and asecond set of turbine-blades intermediate the ends thereof, a headsecured to the casing and having a bore extending therethrough andseparating into a plurality of discharge-passages, a valve in said head,a pair of oppositely-disposed outlets in said casing adjacent to eachset of turbine-blades, a pair of inlets in said casing adjacent to oneset of turbine-blades, a pair of removable slotted plates for conductingmotive fluid from one pair of outlets to one pair of inlets, and fromthe other pair of outlets to the atmosphere, and means for securing animplement to said revolving member.

In testimony whereof I have affixed my signature in the presence of twowitnesses.

EMIL FRANKE. Witnesses:

FRED SUTTER, EDWARD SCHEIBER.

